According to a study done by Men's Fitness earlier this year, the state of California has six of the 15 fittest cities in the entire country. People who live in San Francisco, San Diego, Oakland, San Jose, Long Beach, and, of course, Los Angeles value their health and do everything that they can to stay fit. So it should come as no surprise to hear that, over the years, there have been a lot of different fitness crazes that originated in the Golden State. Here are 10 Fitness Trends That Were Born in California.